This amplified microphone is used to boost sound within a 20-30 foot range. Can be used with any recording device or system with audio recording capabilities. * Not intended for covert audio recording. Check local laws before installation. Specifications: - Omni directional - Sensitivity: -48dB - Frequency 20-20K Hz - S/N Ratio more than 58dB - Impedance 600ohms 20%(at 1K Hz) - Power Input: DC-12V - Power Current: 20mA - Output: RCA